Honestly, i think that the strongest of people are not the physically strongest, but those that are happy with themselves and always see life through a positive perspective. Theres a big difference in someone who is overweight yet is positive vs someone who is overweight and complains and nags about their problem. If both people try to lose the weight, its gonna be the first person that sees the best results; not because they worked any harder, but because they were mentally more positive. Intrisically, no one will ever achieve their desired body image and just "stop" because they have achieved it; humans always desire more than what they already have, so the desire to achieve more will never stop. It is those with positive thoughts and images of their body and general wellbeing and life that will succeed in life.